Expansion of x^4*(1-2*x+x^4)/((1+x)*(1-2*x)^2*(1-x-x^2)).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =2a(6) =6a(7) =13a(8) =31a(9) =68a(10) =151a(11) =327a(12) =706a(13) =1509a(14) =3211a(15) =6796a(16) =14331a(17) =30115a(18) =63106a(19) =131905a(20) =275111a(21) =572676a(22) =1190031a(23) =2469039a(24) =5115426a(25) =10584557a(26) =21874931a(27) =45158908a(28) =93131731a(29) =191884523